title: Validity and reliability of the Japanese version of the painDETECT questionnaire: a multicenter observational study.
abstract: OBJECTIVE
  The aim of this study was to evaluate the validity and reliability of the Japanese version of the painDETECT questionnaire (PDQ-J).
  
  
  METHODS
  The translation of the original PDQ into Japanese was achieved according to the published guidelines. Subsequently, a multicenter observational study was performed to evaluate the validity and reliability of PDQ-J, including 113 Japanese patients suffering from pain.
  
  
  RESULTS
  Factor analysis revealed that the main component of PDQ-J comprises two determinative factors, which account for 62% of the variance observed. Moreover, PDQ-J revealed statistically significant correlation with the intensity of pain (Numerical Rating Scale), Physical Component Score, and Mental Component Score of the Medical Outcomes Study 36-Item Short-Form Health Survey (SF-36). The Cronbach alpha for the total score was 0.78 and for the main component was 0.80. In the analysis of test-retest method, the intraclass correlation coefficient between the two scores was 0.94.
  
  
  CONCLUSIONS
  We demonstrated the validity and reliability of PDQ-J. We encourage researchers and clinicians to use this tool for the assessment of patients who suffer suspected neuropathic pain.
authors.affiliation: Department of Orthopaedic Surgery, Faculty of Medicine, the University of Tokyo, Tokyo, Japan.
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Matsubayashi
authors.forename: Katsushi
authors.initials: K
authors.lastname: Takeshita
authors.forename: Masahiko
authors.initials: M
authors.lastname: Sumitani
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Oshima
authors.forename: Juichi
authors.initials: J
authors.lastname: Tonosu
authors.forename: So
authors.initials: S
authors.lastname: Kato
authors.forename: Junichi
authors.initials: J
authors.lastname: Ohya
authors.forename: Takeshi
authors.initials: T
authors.lastname: Oichi
authors.forename: Naoki
authors.initials: N
authors.lastname: Okamoto
authors.forename: Sakae
authors.initials: S
authors.lastname: Tanaka
mesh_terms: D059026:Diagnostic Self Evaluation; D005163:Factor Analysis, Statistical; D006801:Humans; D007564:Japan; D009437:Neuralgia / Q000175:diagnosis*; D010147:Pain Measurement / Q000592:standards*; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires / Q000592:standards*